package com.muzamilpeer.raspberrypicar.dblayer;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import android.content.Context;
import android.content.ContextWrapper;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;

public class DatabaseHelper extends SQLiteOpenHelper {

	public static String DB_PATH = "";

	public static final String DATABASE_NAME = "raspberrypidb.sqlite";
	public static final int DATABASE_VERSION = 1;
	private Context mContext;

	public DatabaseHelper(Context context) {
		super(context, DATABASE_NAME, null, DATABASE_VERSION);
		mContext = context;
		DB_PATH = "/data/data/" + context.getPackageName() + "/databases/";
	}

	/*------------------Copy Database-------------------------------------*/

	/**
	 * Creates a empty database on the system and rewrites it with your own
	 * database.
	 * */
	public void createDataBase() throws IOException {

		boolean dbExist = checkDataBase();

		if (dbExist) {
			// do nothing - database already exist
		} else {

			// By calling this method and empty database will be created into
			// the default system path
			// of your application so we are gonna be able to overwrite that
			// database with our database.
			this.getReadableDatabase();

			try {

				copyDataBase();

			} catch (IOException e) {

				throw new Error(e.getMessage());

			}
		}

	}

	/**
	 * Check if the database already exist to avoid re-copying the file each
	 * time you open the application.
	 * 
	 * @return true if it exists, false if it doesn't
	 */
	private boolean checkDataBase() {

		SQLiteDatabase checkDB = null;

		try {
			String myPath = DB_PATH + DATABASE_NAME;
			checkDB = SQLiteDatabase.openDatabase(myPath, null,
					SQLiteDatabase.OPEN_READONLY);

		} catch (SQLiteException e) {

			// database does't exist yet.
			Log.e("CHECK DATABSE LOG ERROR",
					"NO DATABASE FOUND, CREATING NEW DATABASE");

		}

		if (checkDB != null) {

			checkDB.close();

		}

		return checkDB != null ? true : false;
	}

	/**
	 * Copies your database from your local assets-folder to the just created
	 * empty database in the system folder, from where it can be accessed and
	 * handled. This is done by transfering bytestream.
	 * */
	private void copyDataBase() throws IOException {

		// Open your local db as the input stream
		InputStream myInput = mContext.getAssets().open(DATABASE_NAME);

		// Path to the just created empty db
		String outFileName = DB_PATH + DATABASE_NAME;

		// Open the empty db as the output stream
		OutputStream myOutput = new FileOutputStream(outFileName);

		// transfer bytes from the inputfile to the outputfile
		byte[] buffer = new byte[1024];
		int length;
		while ((length = myInput.read(buffer)) > 0) {
			myOutput.write(buffer, 0, length);
		}

		// Close the streams
		myOutput.flush();
		myOutput.close();
		myInput.close();

	}

	public SQLiteDatabase openDataBase() throws SQLException {
		// Open the database
		String myPath = DB_PATH + DATABASE_NAME;
		return SQLiteDatabase.openDatabase(myPath, null,
				SQLiteDatabase.OPEN_READWRITE);
	}

	@Override
	public synchronized void close() {
		/*
		 * if (myDataBase != null) myDataBase.close();
		 */
		super.close();

	}

	@Override
	public void onCreate(SQLiteDatabase sqLiteDatabase) {
		// // create all tables
		// sqLiteDatabase.execSQL(UserDAO.getCreateTable(mContext));
		/*
		 * try { createDataBase(); } catch (IOException e) { // TODO
		 * Auto-generated catch block e.printStackTrace(); }
		 */
	}

	@Override
	public void onUpgrade(SQLiteDatabase sqLiteDatabase, int oldVersion,
			int newVersion) {
		if (newVersion > oldVersion) {
			/*
			 * // drop all tables
			 * sqLiteDatabase.execSQL(DBAccess.getDropTable(mContext));
			 * //re-create all tables onCreate(sqLiteDatabase);
			 */
		}
	}
}
